diff --git a/BRANCH_TODO b/BRANCH_TODO
index 920c6f04c6..ae725e118a 100644
--- a/BRANCH_TODO
+++ b/BRANCH_TODO
@@ -1,4 +1,3 @@
- * resolve builtin.zig not working on windows & macos; try os_path_real
  * build & link against libcxx and libcxxabi
  * `zig test`
  * `zig build`
diff --git a/src/codegen.cpp b/src/codegen.cpp
index 6768021410..0a8a1f7a95 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -8861,6 +8861,9 @@ static Error define_builtin_compile_vars(CodeGen *g) {
         g->builtin_zig_path = buf_alloc();
         os_path_join(g->output_dir, buf_create_from_str(builtin_zig_basename), g->builtin_zig_path);
 
+        Buf *resolve_paths[] = { g->builtin_zig_path, };
+        *g->builtin_zig_path = os_path_resolve(resolve_paths, 1);
+
         contents = codegen_generate_builtin_source(g);
         if ((err = os_write_file(g->builtin_zig_path, contents))) {
             fprintf(stderr, "Unable to write file '%s': %s\n", buf_ptr(g->builtin_zig_path), err_str(err));